Hi@Thiyagarajan,
You have one else block in your code. But you didn't write anything inside this block.
if(size_of_cargo1+size_of_cargo2+size_of_cargo3+size_of_cargo4<=Raegan_cargo):
print("Not Possible\n")
else:
#if raegan cargo number is between 0 to (size_of_cargo1-1),
If your below code comes under this else block, then indent your below code with respect to this else block.